Screw-in adapter for a light bulb socket



FIG. 1 is an upper left perspective view of a screw-in adapter for a light bulb socket showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a left side elevational view thereof, the right side elevational view thereof being a mirror image;

FIG. 4 is a bottom plan view thereof. 

The ornamental design for a screw-in adapter for a light bulb socket, as shown and described. 